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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb2362992d5e983317c2442246aa15cc166f4b7943f4f8fb772992a253f3263' 
  AND token = 'Q/M7wlJxVvzrmVtAESevTYWmJcMvvFmPqSMEPpq82sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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