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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c99bd0df855a55d3e47fb5f2e133e52cf3c3e8154aece656249468fa71fb37' 
  AND token = '8yGGV/PT/lTUiXKAloMX47pkrjovrvCukyZpSMwKktE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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