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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018d7aa2b952ae18004c2b65f9a74c9fcd9ae2f47d1fc4584fe992fe88275a0a' 
  AND token = '+r/KERrrML9uTyrjWXqYfEMV0oZsuxeJyf4ZH9qJccs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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