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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cebe1ce97d4ad95fe1f01c92dd8bc93286f6ae8de8bbf80d1d5f62599b7d6e3' 
  AND token = '2ha4Jg4Lf6Q+xd5fS7jqs2xT77C7iL5WRitQD0+sUQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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