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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9fafe7b555f18d8ae27b85559846f22a9a60292bf452e63ac7ef644e32ac05' 
  AND token = '9hAzJI7PHIM430GsyvxfLvy3k3MmFk62lL8yr9Hu6DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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