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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0decd39d9c146bc242b4618ee0cb70c4e71ab0d8cf66fe9c80cee1ea2c16f3a8' 
  AND token = 'EU7lb4zbhMOEYfzp3MwsI+Ian3BKD3kuoNl02+dkTcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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