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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f43e125df068a4b87cb39d3337b625bf5aa8a15add1168bce76a8bef878dab3' 
  AND token = 'Tq4ggbCmcTn/3K9VgU4ph944srE1lVq0qj5d/XeVJtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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