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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9857e0019e2c7b81d44c205c7b70072625f11ae27ab3dd88d5e706e2e818c0f9' 
  AND token = '4CUGmjxJkYPW5F4HJjl2N83Tw9us+41zWtuFfuT1bWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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