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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668b523a9070c662cf8075c235c6829c561eadc70f57e853b328ce31c0281f19' 
  AND token = 'Ur2jzk8AvKq5K9ZfEGd10jlxZbymywlrXxv0Yq1Sp0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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