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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b70b148a105abbc59ab0c4e23dca4d20bae1cdc203e54b0f7c48698ecfe710b' 
  AND token = 'm/KYst04G7cyxl7364DQ4/8p17QMlqxy7WuN/+riZrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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