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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9bff067b6eeb4b4bf72ae7d498168517dd9b66ed48c96ef5abe424cdc536ba' 
  AND token = 'ey/9kaBPdVvoVEgCcgR56nf+iCUEn7hQ3/Z1tdByLIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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