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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802759bc8fceb4851cb4b8a56d15497afa47c22cb076d98fb50ef39c742d9a62' 
  AND token = 'GCHToN9QJ5gm0S+Xg3Qz9DL++aWTmpjrl4HBWmsQooc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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