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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce3384d827c19ed42a64f33dbd7c550cd5e350d765f62b803885d43cc6c4934' 
  AND token = 'EmKk5h/EBOND8C0pve2GBzW2JjDUvEgZvxdIYyKvPOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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