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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461a541feaa270b9ddcb12b85ad4292c5e7d45be7f20f48c51b84c479aa1bdb7' 
  AND token = 'Mo608xV1gUxpy4drQeJkhpWUVmRrsANqQnBYdBxMHHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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