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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b052892b3cc3312695d1d039b1d12517dc8a344aa939c2ee7f99c52a5e87da' 
  AND token = '1jwONiPoaS+zeXO33wYBzzmpinflmVCOWhdezaY/fX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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