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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefb230cf5c08524f95961b12f871be192894ab61a1026c6c0c39c5862723f30' 
  AND token = '44EhYpit0UR1F/sXc5ckpZcnc290qQTjJeznfrw4LJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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