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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34db5febfba881af832d5258378edc3f92d1fe3f3df6759e81ba9e649caf703' 
  AND token = 'J3kSa5Y8GpZxGw5HSxpWf922gNJjDITEhOuLfi9m2GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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