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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684263e212585b4b63f1d9c53481996b9ebd9828b86fdcacac39d011b13dc1ec' 
  AND token = 'Lw41mcQpo++HsLd1PrJYc8BwEaHlruDJJBU9PBu3fF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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