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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f10a433c15e5416e523b5eb3c676e2c5e39e4ce118f767de7f38dea5d0f407' 
  AND token = '6FybzGvS71sMdxNsTIDph6OPYYKf7hoi4egcWS1pNqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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