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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6e6b70b99a66be91e8e56e53bb5fc6915df084e248c050544a2a10c9d94530' 
  AND token = 'alOiCk7T87+bOi1ziLU+VWSZ/XX9+x5mq02Z0wV48G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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