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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1886fced2d323962879a6c985244ad264877a94c0956c6cba717eda83c329ce6' 
  AND token = 'dN5I1pRP8KZJm4bS+jG25+cg6+ll1QJFEw3knhCw7iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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