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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a327a3d5258f28eb2fcd3133e29e7892e8864580e5f8cf9bca013377956c52e' 
  AND token = '2FFN3eOLJcdbQ9r4jXYGAA7VzxksmolH5h23kXDEAYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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