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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fe5d098d02ac0abe001f4b48fa3802561ceb309d165c1c12ee150fe02b099e' 
  AND token = 'zNMRNqzb5N8RV9WsXkgZIm8A8OI2V5eynIp1EUl9o1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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