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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7c3d8fdc1029b9c7f54c63c0f0e92d7bc5a79ed1c1e43cc4e8b916cd851be0' 
  AND token = '11tCGnnngdyFRVFo30AEzgXNoAa7ADFpOtyD8zjU/EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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