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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9b9d819d4a37c588aa98d5fd7d6fcd9aae472b3b1ce61f50abc92120d5c95d' 
  AND token = 'KCF1VaAJQ2Z65Fg43THRsyxb/cLO9Mc1Wxvpf2/CdgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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