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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c365ab84e0790e0965578cc811ce81eb92691c394144e8caaf56a43502a2f41c' 
  AND token = '97TG0y7Xjr0JuIgYZq8ds3WM+GYtWtc/qzazU9jv+w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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