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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0848b4016d85555fb0dabf1e925744b7a27b486912e988017cc2c581cf36e532' 
  AND token = 'QEGH4KuFMuiyn77YVIh8KzWbqKosAXP2vlkMnxMcsG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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