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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f50745bc9a7fdf825b7380dfc5d6a38b05d98dc4228dea01f24fc0c4275743a' 
  AND token = '3e10QK8/ui0G1TwgX8eEPNB49Z+EXr54Z3fuAZfjZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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