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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ac014dcd2f67aa2fd9928b4bc16a05074bbc68a24709939c99f2c0502b135d' 
  AND token = '4vfcRXo84QQ1AxO2C0JXB2WaWbR7cJR1Nk82teSev1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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