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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a065faded9a59256a483950d78809fbe1d619909da52e1ed1d4dcc140afbef' 
  AND token = '85hku+/ES1QUW/qxzuEjesTNdHAxNu/s7wC3jjI4I64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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