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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff518d4f2a2bed0659ea758bd70b90adb5a0025bfa601cfc98d431a88a365a4' 
  AND token = 'NtVYc8oWP9YeEzjLunI9U+Tqjr3WxAc3g10vAq8Y688=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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