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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b30e7e06b4ae4dbb9b4f95a51490befb2383ac465d9cf49175979c60ae4d76' 
  AND token = 'rQZVlNmkgB4tcMl18XtcWhO2iN19jgx4auO9Dfs38fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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