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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c30ff0157aae0b2e09aed843a7328364d5d33133ca138d844943a5f703272a0' 
  AND token = 'ytw55HDeWy0YkuEHdpy5BXsv9BNDrNApPNu6ibmYtr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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