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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316fec194f5d3bf9fb9ff4f1b23028f617b9d59b0c18af43468f03e1fef6a61d' 
  AND token = 'iH5BizLiAHCaKPWsLH4tEjn1OYIfrG3z+MDJ/vHLBi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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