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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc26d6ce7956156eee2e3986357fb3ef2eb4d1008b31c2640c5771553cea8f3' 
  AND token = 'aOaxQzOhRHHVRFwCV2vsUVCWTaWru92UvOKnLbNXl5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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