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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae8c6ec0472b7d4ccd62b325fff4053dd6ae47a4726bb23f57ca67cca22b960' 
  AND token = 'Ph3KCtJDeZtiYvsaFDNERZMObLpYk5hknTnh8lgq3P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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