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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedbacf886ca07f0961bf08001958eadc2aba498da0c9b7026bed9e5fa4df784' 
  AND token = 'Ey7ZjubzKx2c4P9+V02atJgwfkTcro90+0UAaonq1W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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