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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee98e6c414b2efa2475f09e1a8ae7b21c6f93b385f79d713146661ba474c66b' 
  AND token = 'a7qUx6LujleS/foq89BwAhplVd23242uKroXIdWup8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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