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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83810c3b7e553e052eb2c0039cb67aa0919b9fa0eef1523cf1680460eb96f06' 
  AND token = '6uzItq+j9GU5D+9Z5n2LqkphomQoUfRx7QJE3b5tB8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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