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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42dd93e64de6febfa9ebeb91241f55a2301fa15f7deaeb59fb71ecf3bec9bae' 
  AND token = 'dxEbTueTdX+PpO3H/cbYbiRp4itxifryGOzi+8VL3Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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