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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b299bf0861c4d2412a8fc959e9e7f7e0574fce2322f69617334e8bd21a21226b' 
  AND token = 'Pw/Y8+PtdfJJkOWdD2fbBMIJtgznBZ2LEvee5iYfdqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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