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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d43314fa0a74804b9d1dfd27e991512e7e865a82e58767b215922a5c4e1ca9b' 
  AND token = '66BAUYeg9x9Dn7NclI9W9vI5ahdbyRoSkonwmTpEWdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00186

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}