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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee986ab43aa77886f3712a54572fad148c81a2036c9187a9eb61cba6358bb3a' 
  AND token = 'PBqZyb5l583nUHylSLwosPhFTsLKDIO2WQun3XPAKUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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