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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cf1e4308c619efd58ddb74eeb273a5182e0923b0dc8f7791339a3393d80fa3' 
  AND token = '2mcFq2L8N41B3Z5fEJEtipANP3jcizEnzfoVQS7hBdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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