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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e403fb20b0756fd1c37e3aa6d6de5832fe438d9acc50df360fbe540936b371f4' 
  AND token = 'V/vFBHrftKMbq/cqAjmy4JL8e38f+nyEo4lkxqerLdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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