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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df9f84341a94213ffa2fb1bd416e78d227bf35950272aa5124d5d829bb23bf4' 
  AND token = 'AuFj2CeOgQGHn9ZQnZJxUF0Mm95G1Apc/yqiRVNCVa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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