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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed23765d0dbe6c6ef4fba677be966b99740e5a3e18a39b71ef073ff65ffe5a10' 
  AND token = 'vWjqdw7otnElKUKQm/KscsOgA4ucI43aCaTho9bH/xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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