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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca83a2e82c0b42876fd335536b0cb2c0a3c24a29046213dfb328c9049f29e75d' 
  AND token = 'hvrN7/jC0C66N3P8NUaC8Q2aNwHVDcY7ux5HFnv16Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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