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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15f262b2a588204cfc3bb179a7ad0ec9df94e564e6f34e7d3bad0745342cd1d' 
  AND token = 'TFplwkWLikbuVvIiS2opqwIEa/HWcafhwD8WCUZhXfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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