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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0db9d70cd4050811a4f15f525749b6553e313a7ded9d248576df27edd74efa4' 
  AND token = '63QiRFC7yfkUU7YQvvZcmjntsBjAOjTe0ourrKmbkVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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